﻿package birdry.utils
{
	
	import flash.display.Sprite;
	import flash.display.MovieClip;
	import flash.events.Event;
	
	/**
	* ...
	* @author makeFont
	*/
	public class Md5 extends Sprite	{
		
		public function Md5()	{
		}
		
		public static function calcMD5(str:String, hex_chr:String = "0123456789abcdef"): String	{
			var x:Array = str2blks_MD5(str);
			var a:int =  1732584193;
			var b:int = -271733879;
			var c:int = -1732584194;
			var d:int =  271733878;
			
			var olda:int;
			var oldb:int;
			var oldc:int;
			var oldd:int;
			var step;
			
			for(var i:int = 0; i < x.length; i += 16)	{
				olda = a;
				oldb = b;
				oldc = c;
				oldd = d;

				step = 0;
				
				a = ff(a, b, c, d, x[i+ 0], 7 , -680876936);
				d = ff(d, a, b, c, x[i+ 1], 12, -389564586);
				c = ff(c, d, a, b, x[i+ 2], 17,  606105819);
				b = ff(b, c, d, a, x[i+ 3], 22, -1044525330);
				
				a = ff(a, b, c, d, x[i+ 4], 7 , -176418897);
				d = ff(d, a, b, c, x[i+ 5], 12,  1200080426);
				c = ff(c, d, a, b, x[i+ 6], 17, -1473231341);
				b = ff(b, c, d, a, x[i+ 7], 22, -45705983);
				
				a = ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
				d = ff(d, a, b, c, x[i+ 9], 12, -1958414417);
				c = ff(c, d, a, b, x[i+10], 17, -42063);
				b = ff(b, c, d, a, x[i+11], 22, -1990404162);
				
				a = ff(a, b, c, d, x[i+12], 7 ,  1804603682);
				d = ff(d, a, b, c, x[i+13], 12, -40341101);
				c = ff(c, d, a, b, x[i+14], 17, -1502002290);
				b = ff(b, c, d, a, x[i+15], 22,  1236535329);    
				
				a = gg(a, b, c, d, x[i+ 1], 5 , -165796510);
				d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
				c = gg(c, d, a, b, x[i+11], 14,  643717713);
				b = gg(b, c, d, a, x[i+ 0], 20, -373897302);
				
				a = gg(a, b, c, d, x[i+ 5], 5 , -701558691);
				d = gg(d, a, b, c, x[i+10], 9 ,  38016083);
				c = gg(c, d, a, b, x[i+15], 14, -660478335);
				b = gg(b, c, d, a, x[i+ 4], 20, -405537848);
				
				a = gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
				d = gg(d, a, b, c, x[i+14], 9 , -1019803690);
				c = gg(c, d, a, b, x[i+ 3], 14, -187363961);
				b = gg(b, c, d, a, x[i+ 8], 20,  1163531501);
				
				a = gg(a, b, c, d, x[i+13], 5 , -1444681467);
				d = gg(d, a, b, c, x[i+ 2], 9 , -51403784);
				c = gg(c, d, a, b, x[i+ 7], 14,  1735328473);
				b = gg(b, c, d, a, x[i+12], 20, -1926607734);
				
				a = hh(a, b, c, d, x[i+ 5], 4 , -378558);
				d = hh(d, a, b, c, x[i+ 8], 11, -2022574463);
				c = hh(c, d, a, b, x[i+11], 16,  1839030562);
				b = hh(b, c, d, a, x[i+14], 23, -35309556);
				
				a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
				d = hh(d, a, b, c, x[i+ 4], 11,  1272893353);
				c = hh(c, d, a, b, x[i+ 7], 16, -155497632);
				b = hh(b, c, d, a, x[i+10], 23, -1094730640);
				
				a = hh(a, b, c, d, x[i+13], 4 ,  681279174);
				d = hh(d, a, b, c, x[i+ 0], 11, -358537222);
				c = hh(c, d, a, b, x[i+ 3], 16, -722521979);
				b = hh(b, c, d, a, x[i+ 6], 23,  76029189);
				
				a = hh(a, b, c, d, x[i+ 9], 4 , -640364487);
				d = hh(d, a, b, c, x[i+12], 11, -421815835);
				c = hh(c, d, a, b, x[i+15], 16,  530742520);
				b = hh(b, c, d, a, x[i+ 2], 23, -995338651);
				
				a = ii(a, b, c, d, x[i+ 0], 6 , -198630844);
				d = ii(d, a, b, c, x[i+ 7], 10,  1126891415);
				c = ii(c, d, a, b, x[i+14], 15, -1416354905);
				b = ii(b, c, d, a, x[i+ 5], 21, -57434055);
				
				a = ii(a, b, c, d, x[i+12], 6 ,  1700485571);
				d = ii(d, a, b, c, x[i+ 3], 10, -1894986606);
				c = ii(c, d, a, b, x[i+10], 15, -1051523);
				b = ii(b, c, d, a, x[i+ 1], 21, -2054922799);
				
				a = ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
				d = ii(d, a, b, c, x[i+15], 10, -30611744);
				c = ii(c, d, a, b, x[i+ 6], 15, -1560198380);
				b = ii(b, c, d, a, x[i + 13], 21,  1309151649);
				
				a = ii(a, b, c, d, x[i+ 4], 6 , -145523070);
				d = ii(d, a, b, c, x[i+11], 10, -1120210379);
				c = ii(c, d, a, b, x[i+ 2], 15,  718787259);
				b = ii(b, c, d, a, x[i + 9], 21, -343485551);

				a = addme(a, olda);
				b = addme(b, oldb);
				c = addme(c, oldc);
				d = addme(d, oldd);
			}
			return rhex(a, hex_chr) + rhex(b, hex_chr) + rhex(c, hex_chr) + rhex(d, hex_chr);
		}
		
		private static function bitOR(a, b)		{   
			var lsb = (a & 0x1) | (b & 0x1);
			var msb31 = (a >>> 1) | (b >>> 1);
			return (msb31 << 1) | lsb;
		}
		
		private static function bitXOR(a, b)		{   
			var lsb = (a & 0x1) ^ (b & 0x1);
			var msb31 = (a >>> 1) ^ (b >>> 1);
			return (msb31 << 1) | lsb;
		}
		
		private static function bitAND(a, b)	{   
			var lsb = (a & 0x1) & (b & 0x1);
			var msb31 = (a >>> 1) & (b >>> 1);
			return (msb31 << 1) | lsb;
		}
		
		private static function addme(x, y) 	{
			var lsw = (x & 0xFFFF)+(y & 0xFFFF);
			var msw = (x >> 16)+(y >> 16)+(lsw >> 16);
			return (msw << 16) | (lsw & 0xFFFF);
		}
		
		private static function rhex(num:int, hex_chr:String): String	{
			var str:String = "";
			for(var j:int = 0; j <= 3; j++)	{
				str += hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) +
				hex_chr.charAt((num >> (j * 8)) & 0x0F);
			}
			return str;
		}
		
		private static function str2blks_MD5(str): Array		{
			var i:int;
			var nblk:int = ((str.length + 8) >> 6) + 1;
			var blks:Array = new Array(nblk * 16);
			for(i = 0; i < nblk * 16; i++) blks[i] = 0;
			for(i = 0; i < str.length; i++)	{
				blks[i >> 2] |= str.charCodeAt(i) << (((str.length * 8 + i) % 4) * 8);
			}
			blks[i >> 2] |= 0x80 << (((str.length * 8 + i) % 4) * 8);
			var l = str.length * 8;
			blks[nblk * 16 - 2] = (l & 0xFF);
			blks[nblk * 16 - 2] |= ((l >>> 8) & 0xFF) << 8;
			blks[nblk * 16 - 2] |= ((l >>> 16) & 0xFF) << 16;
			blks[nblk * 16 - 2] |= ((l >>> 24) & 0xFF) << 24;
			return blks;
		}
		
		private static function rol(num, cnt)	{
			return (num << cnt) | (num >>> (32 - cnt));
		}
		
		private static function cmn(q, a, b, x, s, t)	{
			return addme(rol((addme(addme(a, q), addme(x, t))), s), b);
		}
		private static function ff(a, b, c, d, x, s, t)		{
			return cmn(bitOR(bitAND(b, c), bitAND((~b), d)), a, b, x, s, t);
		}
		private static function gg(a, b, c, d, x, s, t)	{
			return cmn(bitOR(bitAND(b, d), bitAND(c, (~d))), a, b, x, s, t);
		}
		private static function hh(a, b, c, d, x, s, t)	{
			return cmn(bitXOR(bitXOR(b, c), d), a, b, x, s, t);
		}
		private static function ii(a, b, c, d, x, s, t)	{
			return cmn(bitXOR(c, bitOR(b, (~d))), a, b, x, s, t);
		}
		
	}	// class
	
}	// package